Have you ever been part of a boat test for a magazine? I have, and I sure wouldn't use what they published as a substitute for actual testing.
The people who do these are trying to sell boat --- plain and simple. I've read the article (that's how I found out it takes 3-4 months from the test to published) about the test I was part of. They "bend" the numbers to make things look a "little" better.
I'll just be up front with you. I'm not here because I don't know how to fix this boat. I spent over 30 years as the guy people like you brought the boat to when they couldn't fix it themselves. You are here because you can't fix it yourself.
Your troubleshooting skills are weak.
Your reasoning seems flawed to me.
The testing you have done so far is incomplete.
The opinions you have are based some things you read on the internet --- but only when they agreed with your preconceived ideas.
"Does this drop affect issue with low vacuum which in your opinion doesn't exist - sorry but don't think so."
I don't care what you think, I don't care about a 555 table you found.
I work with facts not speculation.
Low vacuum is only a symptom, not a cause. And yes at this point I don't believe you have low vacuum.
I don't understand why you want to argue with the advise I'm trying to give you. If you want me to, I'll stop posting.
But, I will still try my best to help you.
Fix the voltage issue.
Fix the sea water pressure problem and while you're doing that, if you pull the drive -- count how many times the prop shaft spins when you turn the drive shaft 10 complete revolutions. Or if your just dropping the lower, buy a new o-ring for the top cap and count the teeth.
Try to get a good REC file.
